Scattering theory of magnetic/superconducting junctions with spin active interfaces

Details Scattering theory of magnetic/superconducting junctions with spin active interfaces Scattering theory of magnetic/superconducting junctions with spin active interfaces

2011-07-05

arxiv.org/abs/1107.0819v1

Phys. Rev. B 84, 024531 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages

Scientific paper

10.1103/PhysRevB.84.024531

We formulate a generalized scattering field theory a la Buttiker describing particles transport in magnetic/superconducting heterostructures. The proposed formalism, characterized by a four- component spinorial wavefunction of the Bogoliubov de Gennes theory, allows to describe the spin flipping phenomena induced by noncollinear magnetizations in the scattering region. As a specific application of the theory, we analyze the conductance, the magnetoresistance and the generation of spin-torque produced by an applied voltage in a spin-valve system. Quantum size effects and quantum beating patterns both in the conductance and in the spin-torque are carefully described.

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